Paranormal?

I was going through like the first part of the furnace (not the house thing) when I looked to my left into a window and saw a silhouette standing outside the window , not moving at all. It was a see through shadow, that’s the best way I can explain it . Maybe I was just seeing things but it was really weird.

One of the five most haunted places in the South. “Slag” has stuck around, one of many ghosts wandering around the defunct Sloss Furnaces, sometimes playing with machinery, sometimes just doing some classic haunting.